kupto describes stooping down in the action connected with untying sandal straps.

The attested use describes bending down as part of the action of untying sandal straps in Mark 1:7.

1. Stooping down to untie sandal straps · dominant

   In Mark 1:7, κύψας is an aorist active participle in the clause about being unworthy to perform the action involving the strap of another's sandals; the APB renders the clause "to stoop down and untie."

   Mark 1:7

In the Anselm Project Bible: In Mark 1:7, the APB presents the action as "to stoop down and untie"; The precise contribution of the participle is inferred from its place in the clause.